Crop production on the Indian Subcontinent is low because of the following: A. Overpriced fertilizers
B. Limited access to mechanization
C. Crop disease and natural disasters
D. All of the above

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”